<template>
    <div class="song-list">
        <!-- 歌单详情     -->
    <van-nav-bar
    title="歌单详情"
    left-text="返回"
    left-arrow 
    @click-left="onClickLeft"/>
    <div class="header">
        <img :src="song.logo" alt=""/>
        <h4>{{song.dissname}}</h4>
        <div class="nick">
            <img :src="song.headurl" alt=""/>
            <span>{{song.nickname}}</span>
        </div>
        <span>播放量:{{song.visitnum|numFilter(1)}}万</span>
    </div>
    <!-- 歌单列表 -->
    <div class="list">
    <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了"
        @load="onLoad"
        >
        <div v-for="(item,index) in list" :key="index" :title="item" class="song">
            <h3>{{item.songname}}</h3>
            <div class="singers">
                <span v-for="(singer,index) in item.singer" :key="singer.id">
                    {{singer.name}}
                    <span v-show="index!=item.singer.length-1">/</span>
                </span>
                <span v-show="item.albumname">
                    <span>·</span>
                    <span>{{item.albumname}}</span>
                </span>
            </div>
        </div>    
        </van-list>
    </div>
    </div>
</template>
<script>
export default{
    data(){
        return {
            song: {
                dissname:"",//标题
                logo:"",//歌单logo
                headurl:"",//歌单制作者头像
                nickname:"",//歌单制作者昵称
                visitnum:0,//歌单播放量
            },
            songlist:[],//歌单列表
            songnum:0,//歌曲列表数目
            list: [],
            loading: false,
            finished: false,
        };
    },
    created(){
        this.getListData()
    },
    methods:{
        getListData(){
            this.$request('get','/songlist?id=' + this.$route.params.id)
            .then((res)=>{
                console.log(res)
                this.song.dissname = res.data.dissname;
                this.song.logo = res.data.logo;
                this.song.headurl = res.data.headurl;
                this.song.nickname = res.data.nickname;
                this.song.visitnum = res.data.visitnum;
                this.songlist = res.data.songlist;
                this.songnum = res.data.songnum;
            });
        },
        onClickLeft(){
            //如果历史记录大于1，那么返回到上一层，如果历史记录小于等于1，返回跟踪路由
            window.history.length > 1 ? this.$router.go(-1) : this.$router. push('/');
        },
        onLoad() {
        setTimeout(() => {
            this.list = this.list.concat(this.songlist.splice(0,10))
            this.loading = false;
            if (this.list.length >= this.songnum) {
                this.finished = true;
            }
        },1000);
    },
    },
  
    filters:{
        numFilter(value,num) {
            //把小数点固定为1位
            return parseFloat(value/10000).toFixed(num)
        }
    }
};
</script>
<style scoped>
.header > img {
    width: 50%;
    border-radius: 1rem;
}
.nick {
    overflow: hidden;
}
.nick > img {
    width: 1.5rem;
    border-radius: 50%;
    margin-right: 0.5rem;
}
.nick > span{
    height: 2rem;
    display: inline-block;
    vertical-align: middle;
    font-size: 0.8rem;
}
.header >span {
    font-size: 0.9rem;
}
.song{
    margin-bottom: 1rem;
}
.song>h3{
    text-align: left;
    font-size: 1rem;
    padding: 0 2rem;
    margin: 0;
}
.singers{
    text-align: left;
    padding: 0 2rem;
}
.singers span{
    font-size: 0.8rem;
    color: gray;
}
.singers>span:nth-last-child(1)>span:nth-child(1){
    margin: 0 0.3rem;
    font-weight: 900;
    color: red;
}
</style>